“Pulse oximetry can also deliver important COVID-19 clues for people at home, though there are asterisks.”
“A typical person’s oxygen-saturation percentage level hovers between the mid-90s and 100. But readings taken at home showing 85% saturation and dropping can be an early warning sign of COVID-19.”
“Dave Hemink, CEO of Nonin Medical, said an early-warning signal like a low-oxygen saturation could cause people to call the hospital or clinic for help sooner, which is why the devices are becoming more common in first-aid kits at home — for those who can buy them.”
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